Engine.



J. Z. SAVOIE.

ENGINE.

I APPLIOA'I'ION FILED 31 11.16. 1908. v 981,316. I Patented Jan 10, 1911.

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J. z. SAVOIE. ENGINE.

APPLICATION FILED JANJB. 190B.

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Patented Jan.10,1911

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' ,J; z. SAVOIE.

I ENGINE. APPLIOATION FILED JAN. 16. 1908.

Patented mi 10, 1911.

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WITNZESEE draw INK/ENTERS increase the power,

UNETEE STATES JOSEPH Z.

severe, or PROVIDENCE, ma

PATENT cl rion.

(ms remap.

ENGINE.

Specification of Letters Patent.

Patented Jan. to, 19111.

Application filed January 16,'1908. Serial No. 411,080.

To all whom it may concern:

Be it known that I, Josnrrr Z. Savors, a citizen of the United 'States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Engines,

of which the following is a specification.

This invention has reference to an improvement in gas engines and more par-' ticularly to an improvement in rotary gas ,engines.

The ob ect of my invention is to 'HIIPIOVG the construction of a four cycle air cooled rotary gas engine, whereby a plurality of air cooled cylinders revolve around afixd crank shaft.

Further objects of my invention are to reduce the vibration, lessen the weight, and simplify the construction of an air cooled four cycle rotary gas.

engine having a plurality of air cooled cyl inders adapted to revolve around a fixed crank shaft.

A still further object of my invention is to reduce the cost of manufacturing rotary gas having a plurality of air cooled cyli id My invention consists in the peculiar and novel construct on of an air cooled rotary gas engine, said rotary gas engine having .lctaii of construction, as will be more. fully set. forth hereinafter and claimed.

Figure 1 is a vertical view partly 111 section looking at the valve side of the engine.

' Fig. :2 is a vertical sectional view taken apdetail side view of the distributor forming a part of the sparking mechanism, and Fig. 7 is a detail transverse sectional viewthrough the muttler.

In the. drawings, a. indicates the frame of my improved rotary gas engine, I) the fixed crank shaft, 0 the engine casing, d (I the air cooled cylinders, e e the cylinder heads, f f i the pistons, g and h h the connecting rmls,

i the intake valve, la; the exhaust valve, t the valve operating mechanism, m the c rcular mufller, n the sparking mechanism,

0 o the spark plugs, p a wire leadingfrom the battery and spark coil (not shown) to the distributer in the sparkin mechanism a, 1' 1- wires leading from the istributer to the spark plugs 0 0, and .9 the wire leading from the timer in the sparking mechanism to the battery. q

The frame a may be of any shape or configuration. As shown in the drawings the frame a consists of a base 8 having the ver-- tical support 9 at one end 'with thehub 10 and the vertical support 11 at the opposite end with the bearing 12, as shown in Fig.2.

The fixed crank shaft b has the tubular end 13 extending through. the hub 10 and forming the intake pipe for the engine, the central fixed crank 14 in the engine'casing 0, the solid end 15 extending into the hearing 12 and theoil' duct 16 which extends first lengthwise on the top of thetubular end 13 from anoil hole in the hub 10 to the crank 14, as shown in' Fig. 2. The tubular end 13 of the crank shaft. is secured in the hub 10 in any well known way. i

The engine casing 0 consists of a five sided hollow casting or peripheral collar 17 having a circular hole in each flat peripheral side for the cylinders d d and open ends closed by aplate 18 secured to the casting 17 and having a central bearing 19 rotatably supported on the tubular end 13 of the fixed crank shaftb, and a plate 20 secured to the casting 17 having the central tubular hub 21 rotatably supported on the solid end 15 of the crank shaft 6 and extending-through the bearing 12. A driving pulley 22, or other means of transmitting power, is secured to or on the outer end of the tubularhub 21, as shown in Fig. 2. Said end closing plates 18 and 20 are provided with peripheral flanges 18 and 20 by means of which the plates are secured. in suitable manner to the collar 0. The flange on plate 18, which is on that side of the casting or collar 0 which carries the valve casings and gearing is formed of sufficient depth to provide a housing for the valve driving 1nechanism hereinafterdescribed, and is provided therein of valvestems 37.

The cylinders (l d each have the cylindri- 'with hushed apertures 19' to permit the projection and operation cal b'ore 23- for the pistons f, the reduced inner end 24 where they enter the circular vsaid flange 18 of posit-ion to the eran .h'hles in'the periphery-of the engine casing c,

and the usual radial coolingflanges 25 25,

- as shown in Figs. 1 and 2.

The cylinder'heads'e e are each constructed to fit the outer ends' of the cylinders. (Z d and to have the intakeport 26 controlled by the intake valve f5 and connected to the interior of the engine casing c bylthe'intake pipe 27, the exhaust port 28 controlled by] the exhaust valve 70' and connected to the muffler m by the exhaust pipe 29, the port 30 leading from the. intake and exhaust ports 26 and 28 to the compression. chamber 7 31 and the radial cooling flanges 32 32, as

shown in Figs. 2, 3 and 4. The spark plug 0 extends into the port 30" above the intake,

valve 2','as shown in Fig. 2 The pistons j are of the usual form and have a sliding fit.

in the 'cyliiidersd d, as shown in Figs; 1 and 2. The connecting rod 9 has its outer end pivotally. secured to a piston fiby a wrist pin 33 driven transversely through the piston and an enlarged inner end 34rotatably se-' cured to the crank 14. The connecting rods "70h are pivotally secured at'their outer ends to the pistons fand are pivotally :se-

cured at their. inner .ends 35 -35 to the enlarged inner end-34 of' thefconnect ingg-rod g. in a circle at, equal distances apart, asshown in' Figs. 1 and-12: The

oil duct 16 ex tends'down through the :crank 14 tothe center of the'crank'where it 'sep'-- I arates 'i-nto five oilducts. Each -.oil duct 16 now extends lengthwise through 9. connect-.

ing rod into a wrist pin. 33 and then out through eachend of the wrist pin, as shown infull and broken lines in Fig. 2, thereby lubricating the crank 14, the inner and'outer ends of the connecting rods-g and? h, and the pistons f f in the cylinders d'd.

The intake and exhaust valves 2'. and. k are interchangeable and each has the usual head 36, the stem'37, which extends through its corresponding bushed aperture 19 in late 18, and the coiled s rin 38 for holding the valves in their 0 osed or normal posit1ons,'as shown in 2 and 3.

The valve operating mechanism --Z consists of a worm'39 secured from rotating on thetubular end 13 of the crank shaft]; in the casing c, a cam shaft-4O for each set of'valves and rotatably secured in bearings 41 41 to the-inner face of the late 18 in a transverse E shaft b. Each cam shafthas a worm ear 42 meshing with the fixed worm 39, an intake cam 43 and an exhaust cam 44. The slides 45 and 46 are reciprocally supportedin the periphery of the plate 18 in a position for the intake cam 43 to engage with a roll on theinner end of theslide 45 and for the outer end of the slide 45 to engage with the end of the stem of the intake valve 2 and for the exhaust cam 44 to en age with a roll on the'inner end of the li e 46 andfo'r the outer end of the'slide 46 to engage with the end of the stem of the exhaust valve is, as shown in Fig. 3.

The circular mufiier m is in the form of an annular trough having inlet openings for the exhaust pipes-29 29, the internal annular ledges 47 47, a circular plate 48 in'the form ofa flat ring adapted to loosely fit in the trough on the annular ledges 47 47' and formingfan inclosed circular chamber 49, a circular-plate 50 in the form of a fiat ringadapted to 'close the open face of the mufflerv and forming a circular chamber 51, a series of stems 52 52 secured at their inner ends to the backs of the circular plates 48 and 50 and extending-through holes in the back of the mufiier, (the stems52- 52 on the plate 50 extending'through holesin the p1ate47) each stem 52 'havln a-wa'sher secured on its endand a coile 'spring 54 intermediate the. :w'asher and the back of the muffler,- whereby the circular-plates 48-and 50 are held in their clqsed'or normal positions un- -.der"spring tension, as shown in Figs. 2 and 7. The 'mutfler is adjustably securedto the cylinder heads ehy the bolts 55 and 56, as s own in Fig. 2, and revolves with'the engins. i

The. sparkingmechanismmcomprises a of twice its diameter on a shaft 59 rotatably supported-in: bearings (not shown) on the support 11, afi'vepointedstar cam 60 secured on the shaft 59 in a position to engage with a contact spring '61 supported at one end in a frame 62 pivotally supported on the ated contact supported on the tubular end 13 of the crank shaft?) and constructed tohavean insulated contact point 72in a position to engagein "gear 57 's'ecured t9 or forming apart of the 'tubular 'hub 21 and meshing with .a gear 58 points 70 inacircle at equal distances apart and each contact point 70 is elect-rically connected to a spark plug 0 by a wire 1'. -A circular-insulating plate 71 is rotatably succession withthe contact points 70 70 on.

.the plate 69 and an arm (3 'pivotally connected to a rod' 74'Wl1ich in turnis pivotally connected to an arm 75 secured to the trans verse shaft 67, as shown in FigsLjZ, Sand 6.

The contact point 72 is electrically connected to the spark coil of the battery (not shown) by thewire p. By this construction the star cam 60 in. the timer is given one-half a, revolution for one revolution of the engine, and the plate'il ofthe distributor is moved wheniequired in unison with the frame 62-- of the timer, wherebythe contact point 72 in the distributor is always in a position to form an electrical contact with one of the contactpoints 70 in the plate 69 of the distributer, when the contact spring 61' of the. to timer is forced by ,the cam 60 into contact with the contact screw 63. By moving the hand lever 66 toward the engine the spark is advanced and by'areverse movement of the lever 66 the spark is retarded.

In the operation of my improved four cycle rotary gas engine the tubular end 13 of the fixed crank shaft 6 is connected to a carbureter or source of gas supply (not shown) and the wires 17 and s electrically 20 connected to a spark coiland battery (not shown). Starting with a' cylinder in the lowest position, the intake valve '5 is opened by the valve operating mechanism Z andthe function of suction is performed in the first Z5 half revolution of the engine, the gas being drawn through the tubular end 13 of the'crank shaft b, the .engine casing the intake pipe 27, the intake port 26 and the port 30 into the cylinder, and the intake 30 valve 1' closed. Thegas is now compressed in the second half revolution and exploded when the cylinder has reached its approximately lowest position through and controlled by the sparking mechanism "It. The

engine is now driven in the direction of the arrow, as shown in Fig. 1, for the third half of a. revolution or during the working stroke of the piston. On the fourth half of a revolution the exhaust valve 70 is 40 opened by the valve operating mechanism Z- and by the time the cylinder has reached its lowest. osition the burned gases have been force out through the exhaust port 28, the exhaust pipe 29 and the mutiier m. The exhaust valve 70 is now closed. These operations are now repeated successively in each cylinder, an explosion, taking place in every second cylinder as it reaches approximately its lowest point, or five ex- 60 plosion or Working strpkes for each two revolutions of the engine. The exhaust or burned gases first exhaust into the circular chamber 49 in the muflier at whenthe force of the exhaust moves the circular ring 48 'outwa'rd against the tension of the coiled springs 545a and allows the burned gases to further exhaust. into the circular chamber 51 whenthe force of theexhaust will move the circular plate 50 outward against the tension of the springs 54 54 and allow the exhaust to escape'from the mufllcr, thereby silencing the exhaust.

I do not wish o continemyself to the number of cylinders shown. as it is evident that the engine may be constructed to have I any number of cylinders, without mate .rially affecting the spirit of my invention.

Having thusdescribed my invention, claim as new and desire to secureby Let ters Patent;- I I 1. A rotary gas engine, comprising in combination, a hollowvfixed crank sha a crank casing rotatable on said shaft and communicating with saidhollow crank shaft to form a fuel chamber, cylinders'on said casing, pistons slidable in said cyl1n-' ders and connected to said crank shaft, re-

movable heads on said cylinders provided with offset valve chambers, fuel feeding conduits connected said fuel chamber and so,

said valve chambers,- valves operated within said valve chambers, and valve operating mechanism connected to said valves and actuated from said shaft, said casing consist ing of a polygonal peripheral member hav 35 ing a cylinder on each face, and end plates seated on saideri heral member, theend plate on one-g side heing offset to form' a housing to fcontain the valve operating mechanism and through which thelatter '90- extends. p

2. A. rotary gas engine, comprising, in combination, a hollow fixed crank shaft, a crank casing rotatable on said sha'ft,and communicating with said. hollow? crank shaft to form a fuel chamber, cylinders onsaid casing, pistons slidable in said cylinders and connected to said crank shaft, removable heads on said cylinders provided with offset valve chambers having outlet 10 and inlet valve openings, and an ignition; chamber, and valves operative in said chem-- bers. conduits forming feeding means between said casing and said inlet valve openings, and valve operating mechanism mountit ed. on said shaft and easing, said casingbeing provided on one side with a dished side to form a housing for said valve operating mechanism, and said valve chambers being located opposite saidhousing to pr'e- .11 sent the valve stems of the inlet and exhaust valves in juxtaposition to saidlvalve operating mechanism.

3. A rotary gas engine, comprising, in. combination, a hollow fixed crank shaft, a 1 crank casing rotatable on said shaft and communicating with the latter to provide a fuel chamber, aplurality of cylinders- .sca'ted and secured in apertures in said casing, pistons slidable in said cylindersand 1 connected to said crank shaft, removable heads on said cylinders, valve casings formed on said heads at one sidethereof, inlet and outletvalves carried by said casings, conduits for feeding fuel from the in- J terior of said crank'casing to said inlet valves, and means operative within said crank casing for reciprocating said valves, said crank cas1n; comprising a polygonal peripheral collar, end plates having hollow 1 sliaftbearings; andfianges :said end plat-cs In testimony- Whereof I have signed my abutting paid polygonal peripheral collar, name to this specification in he-presence of tlic flange on said plate adjacent'said valvg two subscribing Witnesses.

casings'bcing of Substantial (l'p th and pro- 1 JOSEPH Z. SAVOIE. 5 vidccl with apertures, -to permit the housing VVitucsses:

and the; projection through saidjapertures ADA E. HAGERTY,

of said valve operating mechanism. w .J. A. MlLLER. 

